WO2023098466A1

WO2023098466A1 - Optical module and los optimization method for optical module

Info

Publication number: WO2023098466A1
Application number: PCT/CN2022/131959
Authority: WO
Inventors: 李福宾; 朱晓勐; 薛登山
Original assignee: 青岛海信宽带多媒体技术有限公司
Priority date: 2021-12-03
Filing date: 2022-11-15
Publication date: 2023-06-08

Abstract

The present application provides an optical module and a LOS optimization method for the optical module. The optical module comprises: a photodetector, used for converting an optical signal into an electrical signal; a limiting amplifier, provided with a LOS signal pin for outputting a high level or a low level; an APD boost circuit, comprising: a control interface, a power supply interface connected to the photodetector, and an output interface for outputting a power signal of the optical signal; and an MCU, comprising: a detection pin connected to the output interface and receiving the power signal, an input pin connected to the limiting amplifier and used for the high level or the low level, and an adjustment pin connected to the control interface, a power signal monitoring value being provided inside the MCU, and when it is determined by operation that the power signal is less than the monitoring value and the input pin receives the high level, the adjustment pin sending a signal to the control interface, and an output voltage of the power supply interface being increased. In embodiments of the present application, LOS performance of the optical module is optimized by configuring an appropriate monitoring value and an appropriate voltage increase value by means of the MCU.

Description

A kind of optical module and optical module LOS optimization method

Cross References to Related Applications

This disclosure claims the priority of the Chinese patent application with the application number 202111474837.6 and the application title "An optical module and an optical module LOS optimization method" submitted to the China Patent Office on December 03, 2021, the entire contents of which are incorporated herein by reference. In the process of being disclosed; this disclosure claims the priority of the Chinese patent application submitted to the China Patent Office on December 03, 2021, with the application number 202111511278.1 and the application title "An Optical Module and an Optical Module LOS Optimization Method", the entire contents of which are incorporated by reference incorporated in this disclosure.

technical field

The present disclosure relates to the technical field of communications, and in particular to an optical module and an optical module LOS optimization method.

Background technique

With the development of cloud computing, mobile Internet, video and other new business and application models, the development and progress of optical communication technology has become more and more important. In optical communication technology, the optical module is a tool to realize the mutual conversion of photoelectric signals, and is one of the key components in optical communication equipment.

In the application, there is a type of optical module whose rate is not high, but requires a long transmission distance. Because of the long-distance transmission, the sensitivity of the optical receiver, LOSD (Loss of Signal Deassert, signal loss alarm release), LOSA (Loss of Signal Assert, signal loss alarm on) and LOSH (Loss of Signal Hysteresis, optical signal loss hysteresis) ) and other indicators are approaching the limit. When the received optical power is very small, the amplitude of the electrical signal generated by the optical detector converting the optical signal is small, and there is a certain defect rate, resulting in a cost loss of the optical module.

Contents of the invention

An embodiment of the present disclosure discloses an optical module, including:

Photodetectors for converting optical signals into electrical signals;

The limiting amplifier is used to set the LOS signal pin to output high level or low level;

APD boost circuit, including:

control interface;

The power supply interface is connected with the photodetector to supply power to the photodetector;

Output interface, outputting the power signal of the optical signal;

MCUs, including:

The detection pin is connected to the output interface to receive the power signal;

The input pin is connected with the limiting amplifier for receiving high level or low level;

The adjustment pin is connected with the control interface;

The MCU is equipped with a power signal monitoring value; when the calculation determines that the power signal is less than the monitoring value, and the input pin receives a high level, the adjustment pin sends a signal to the control interface, and the output voltage of the power supply interface rises.

The embodiment of the present disclosure discloses an optical module LOS optimization method, including: calculating the current optical power according to the power signal;

The current optical power is not less than the preset optical power threshold, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

The current optical power is less than the preset optical power threshold, and the LOS signal is not received, and the output voltage of the APD boost circuit is controlled to be the second output voltage;

The current optical power is less than the preset optical power threshold, and the LOS signal is received, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

Wherein, the second output voltage is higher than the first output voltage.

Description of drawings

The accompanying drawings used in some embodiments of the present disclosure will be briefly introduced below. Obviously, the accompanying drawings in the following description are only drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, Additional figures can be derived from these figures. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of signals, and the like.

Fig. 1 is a connection diagram of an optical communication system according to some embodiments;

Fig. 2 is a structural diagram of an optical network terminal according to some embodiments;

Fig. 3 is a structural diagram of an optical module according to some embodiments;

Figure 4 is an exploded view of an optical module according to some embodiments;

5 is a schematic structural diagram of a circuit board in an optical module according to some embodiments;

Fig. 6 is a schematic diagram of a light receiving component according to some embodiments;

Fig. 7 is a schematic diagram of another light receiving component according to some embodiments;

FIG. 8 is a schematic diagram of another light receiving component according to some embodiments.

Detailed ways

The implementation manners in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments provided in the present disclosure belong to the protection scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the term "comprise" and other forms such as the third person singular "comprises" and the present participle "comprising" are used Interpreted as the meaning of openness and inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific examples" example)" or "some examples (some examples)" etc. are intended to indicate that specific features, structures, materials or characteristics related to the embodiment or examples are included in at least one embodiment or example of the present disclosure. Schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used when describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited by the context herein.

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and both include the following combinations of A, B and C: A only, B only, C only, A and B A combination of A and C, a combination of B and C, and a combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and a combination of A and B.

The use of "suitable for" or "configured to" herein means open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

As used herein, "about", "approximately" or "approximately" includes the stated value as well as the average within an acceptable deviation range from the specified value, where the acceptable deviation range is considered by one of ordinary skill in the art Determined by the measurement in question and the errors associated with the measurement of a particular quantity (ie, limitations of the measurement system).

In optical communication technology, light is used to carry information to be transmitted, and the optical signal carrying information is transmitted to information processing equipment such as a computer through optical fiber or optical waveguide and other information transmission equipment to complete the information transmission. Because optical signals have passive transmission characteristics when they are transmitted through optical fibers or optical waveguides, low-cost, low-loss information transmission can be achieved. In addition, the signals transmitted by information transmission equipment such as optical fibers or optical waveguides are optical signals, while the signals that can be recognized and processed by information processing equipment such as computers are electrical signals. To establish an information connection between them, it is necessary to realize the mutual conversion of electrical signals and optical signals.

The optical module realizes the mutual conversion function of the above-mentioned optical signal and electrical signal in the technical field of optical fiber communication. The optical module includes an optical port and an electrical port. The optical module realizes optical communication with information transmission equipment such as optical fiber or optical waveguide through the optical port, and realizes the electrical connection with the optical network terminal (such as an optical modem) through the electrical port. It is mainly used to realize power supply, I2C signal transmission, data signal transmission and grounding, etc.; the optical network terminal transmits electrical signals to information processing equipment such as computers through network cables or wireless fidelity technology (Wi-Fi).

Fig. 1 is a connection diagram of an optical communication system according to some embodiments. As shown in Figure 1, the optical communication system mainly includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101 and a network cable 103;

One end of the optical fiber 101 is connected to the remote server 1000 , and the other end is connected to the optical network terminal 100 through the optical module 200 . Optical fiber itself can support long-distance signal transmission, such as signal transmission of several kilometers (6 kilometers to 8 kilometers). On this basis, if repeaters are used, ultra-long-distance transmission can theoretically be achieved. Therefore, in a common optical communication system, the distance between the remote server 1000 and the optical network terminal 100 can usually reach thousands of kilometers, tens of kilometers or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000 , and the other end is connected to the optical network terminal 100 . The local information processing device 2000 may be any one or more of the following devices: routers, switches, computers, mobile phones, tablet computers, televisions, and so on.

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing device 2000 and the optical network terminal 100 . The connection between the local information processing device 2000 and the remote server 1000 is completed by the optical fiber 101 and the network cable 103 ; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100 .

The optical module 200 includes an optical port and an electrical port. The optical port is configured to be connected to the optical fiber 101, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; electrical signal connection. The optical module 200 implements mutual conversion between optical signals and electrical signals, so that a connection is established between the optical fiber 101 and the optical network terminal 100 . For example, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100 , and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101 .

The optical network terminal 100 includes a substantially rectangular parallelepiped housing (housing), and an optical module interface 102 and a network cable interface 104 disposed on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 and the optical module 200 establish a bidirectional electrical signal connection; the network cable interface 104 is configured to access the network cable 103, so that the optical network terminal 100 and the network cable 103 A two-way electrical signal connection is established. A connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100 . For example, the optical network terminal 100 transmits the electrical signal from the optical module 200 to the network cable 103, and transmits the signal from the network cable 103 to the optical module 200. Therefore, the optical network terminal 100, as the host computer of the optical module 200, can monitor the optical module 200 work. In addition to the optical network terminal 100, the host computer of the optical module 200 may also include an OLT (Optical Line Terminal, optical line terminal) and the like.

The remote server 1000 establishes a two-way signal transmission channel with the local information processing device 2000 through the optical fiber 101 , the optical module 200 , the optical network terminal 100 and the network cable 103 .

FIG. 2 is a structural diagram of an optical network terminal according to some embodiments. In order to clearly show the connection relationship between the optical module 200 and the optical network terminal 100, FIG. 2 only shows the optical network terminal 100 related to the optical module 200. structure. As shown in FIG. 2 , the optical network terminal 100 further includes a PCB circuit board 105 disposed in the casing, a cage 106 disposed on the surface of the PCB circuit board 105 , and an electrical connector disposed inside the cage 106 . The electrical connector is configured to be connected to the electrical port of the optical module 200; the heat sink 107 has fins and other raised parts that increase the heat dissipation area.

The optical module 200 is inserted into the cage 106 of the optical network terminal 100 , and the optical module 200 is fixed by the cage 106 . The heat generated by the optical module 200 is conducted to the cage 106 and then diffused through the radiator 107 . After the optical module 200 is inserted into the cage 106 , the electrical port of the optical module 200 is connected to the electrical connector inside the cage 106 , so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100 . In addition, the optical port of the optical module 200 is connected to the optical fiber 101 , so that the optical module 200 and the optical fiber 101 establish a bidirectional electrical signal connection.

Fig. 3 is a structural diagram of an optical module according to some embodiments, and Fig. 4 is an exploded view of an optical module according to some embodiments. As shown in FIGS. 3 and 4 , the optical module 200 includes a housing, a circuit board 300 disposed in the housing, and optical transceiver components;

The casing includes an upper casing 201 and a lower casing 202. The upper casing 201 is covered on the lower casing 202 to form the above casing with two

openings

204 and 205; the outer contour of the casing is generally square.

In some embodiments of the present disclosure, the lower case 202 includes a bottom plate and two lower side plates located on both sides of the bottom plate and perpendicular to the bottom plate; The two upper side plates are combined by two side walls and two side plates to realize that the upper case 201 is covered on the lower case 202 .

The direction of the line connecting the two

openings

204 and 205 may be consistent with the length direction of the optical module 200 , or may not be consistent with the length direction of the optical module 200 . For example, the opening 204 is located at the end of the optical module 200 (the left end in FIG. 3 ), and the opening 205 is also located at the end of the optical module 200 (the right end in FIG. 3 ). Alternatively, the opening 204 is located at the end of the optical module 200 , while the opening 205 is located at the side of the optical module 200 . Wherein, the opening 204 is an electrical port, and the golden finger of the circuit board 300 is stretched out from the electrical port 204, and is inserted into a host computer (such as the optical network terminal 100); the opening 205 is an optical port, configured to be connected to an external optical fiber 101, so that The optical fiber 101 is connected to the optical transceiver components inside the optical module 200 .

The combination of the upper case 201 and the lower case 202 is used to facilitate the installation of components such as the circuit board 300 and optical transceiver components into the case, and the upper case 201 and the lower case 202 can form packaging protection for these devices. In addition, when assembling components such as the circuit board 300 , it is convenient to deploy the positioning components, heat dissipation components and electromagnetic shielding components of these components, which is conducive to the implementation of automatic production.

In some embodiments, the upper shell 201 and the lower shell 202 are generally made of metal materials, which is beneficial to realize electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking part 203 located on the outer wall of its housing, and the unlocking part 203 is configured to realize a fixed connection between the optical module 200 and the host computer, or release the connection between the optical module 200 and the host computer. fixed connection.

Exemplarily, the unlocking component 203 is located on the outer walls of the two lower side panels 2022 of the lower housing 202 , and includes an engaging component matching a cage of the upper computer (eg, the cage 106 of the optical network terminal 100 ). When the optical module 200 is inserted into the cage of the host computer, the optical module 200 is fixed in the cage of the host computer by the engaging part of the unlocking part 203; when the unlocking part 203 is pulled, the engaging part of the unlocking part 203 moves accordingly, thereby changing The connection relationship between the engaging part and the host computer is to release the engagement relationship between the optical module 200 and the host computer, so that the optical module 200 can be pulled out from the cage of the host computer.

The circuit board 300 includes circuit traces, electronic components and chips, through which the electronic components and chips are connected together according to the circuit design, so as to realize functions such as power supply, electrical signal transmission and grounding. The electronic components may include, for example, capacitors, resistors, triodes, and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide-Semiconductor Field-Effect Transistor). For example, the chip can include MCU (Microcontroller Unit, micro control unit), limiting amplifier (limiting amplifier), CDR (Clock and Data Recovery, clock data recovery chip), power management chip, DSP (Digital Signal Processing, digital signal processing) chip .

The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the bearing function, such as the rigid circuit board can carry the chip stably; the rigid circuit board can also be inserted into the electrical connector in the cage of the upper computer .

The circuit board 300 also includes a gold finger 301 formed on the surface of its end, and the gold finger 301 is composed of a plurality of independent pins. The circuit board 300 is inserted into the cage 106 , and is conductively connected with the electrical connector in the cage 106 by the gold finger 301 . Gold fingers 301 can be set on only one side of the circuit board 300 (such as the upper surface shown in FIG. 4 ), or can be set on the upper and lower sides of the circuit board 300, so as to meet the occasions where the number of pins is large. The golden finger 301 is configured to establish an electrical connection with a host computer to realize power supply, grounding, I2C signal transmission, data signal transmission, and the like. Of course, flexible circuit boards are also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards as a supplement to rigid circuit boards.

The optical transceiver part includes a light emitting part and a light receiving part.

The optical module for long-distance transmission has high requirements on the sensitivity index of the optical receiving part, so that the optical receiving part needs to work in a very small range of received optical power, and at the same time, the LOS threshold also needs to be set very small, and the LOSD must be guaranteed There is some hysteresis with LOSA. In order to optimize the LOS index of the light receiving part and increase the differential output amplitude of the light detector, the present disclosure is proposed.

Fig. 5 is a schematic structural diagram of a circuit board in an optical module according to some embodiments. As shown in FIG. 5 , in the optical module provided in the embodiment of the present disclosure, the circuit board 300 further includes an MCU 301 . In this embodiment, the MCU301 is connected with the photodetector and the limiting amplifier for monitoring the optical power of the photodetector and the LOS (Loss of Signal, loss of signal) signal of the limiting amplifier, and the operating voltage of the photodetector Make adjustments. Wherein, the LOS signal may be called an alarm signal, which refers to an LOS alarm signal that occurs when the receiving end of the communication system cannot receive the signal transmitted from the sending end.

FIG. 6 is a schematic diagram of a light receiving component according to some embodiments. As shown in the figure, the light receiving component includes: a light detector, which converts the received light signal into an electrical signal. APD (Avalanche Photo Diode, avalanche photodiode) booster circuit, the first end of which is connected to the photodetector to provide a reverse working voltage for the photodetector. The second terminal of the APD boost circuit is connected to the first terminal of the MCU, and is used to output the power signal of the received optical signal to the MCU. The second terminal of the MCU is connected to the third terminal of the APD boost circuit, and outputs a control signal to the APD boost circuit to control the output voltage of the APD boost circuit. The optical detector is also connected with a limited amplifier for amplifying the optical signal output by the optical detector, and outputting the amplified electrical signal to the host computer. The limiting amplifier is also connected with the MCU. The third end of the MCU is connected with the limiting amplifier to receive the LOS signal.

The limiting amplifier is used to set the LOS signal pin to output high level or low level. The limiting amplifier is provided with a signal input terminal, is connected with the photodetector, and receives the electric signal output by the photodetector. The limiting amplifier is equipped with a LOS threshold; when the operation judges that the electrical signal is smaller than the LOS threshold, it outputs a high level. Otherwise, output low level. In the embodiment of the present disclosure, the LOS signal pin of the limiting amplifier outputs a high level, which is the LOS signal.

In order to improve the sensitivity of the photodetector and increase the detection light power range of the photodetector, in the embodiment provided by the present disclosure, the MCU has built-in registers, and monitors values in the registers. The MCU adjusts the control signal output to the APD boost circuit according to the power signal, and controls the output voltage of the APD boost circuit.

In a certain embodiment of the present disclosure, the first end of the APD boost circuit is connected to the APD pin of the photodetector, and is used to provide the APD photodiode with a reverse working high voltage.

In an embodiment of the present disclosure, the first end of the APD boost circuit is a power supply interface, the second end is an output interface, and the third end is a control interface. The first end of the MCU is a detection pin, the second end is an adjustment pin, and the third end is an input pin.

In the embodiment of the present disclosure, the APD boost circuit is provided with a current mirror circuit, which outputs the current flowing into the photodetector to the MCU in a certain proportion, so as to monitor the photocurrent detected by the photodetector, form a power signal and send it to the MCU.

The second terminal of the MCU is connected to the third terminal of the APD boost circuit, and outputs a control signal to the APD boost circuit to control the output voltage of the APD boost circuit. When the power signal received by the MCU is lower than the monitoring value, the output voltage of the APD boost circuit is controlled to increase a certain preset voltage value. According to the working principle of the photodetector, the output voltage of the APD booster circuit increases, and the amplitude of the output of the photodetector increases, which increases the differential output amplitude of the photodetector and optimizes the LOS performance.

The monitoring value can be set according to the comparison between the power signal and the optical power. Usually the optical power corresponding to the monitoring value is greater than the value of the minimum optical power that can be detected by the optical detector.

In an embodiment of the present disclosure, the MCU is configured to control the output voltage of the APD boost circuit to increase if the power signal is smaller than the monitoring value and no LOS signal is received. The output voltage of the APD boost circuit increases, and the minimum value of the detected optical power of the photodetector becomes smaller than before the boost, which increases the differential output amplitude of the photodetector, optimizes the LOS performance, and realizes the optimization of the LOS function of the light receiving part. .

If the output voltage of the APD boost circuit keeps increasing for a long time, the damage to the photodetector will be greater. After the MCU receives the LOS signal, it will control the output voltage of the APD boost circuit to restore the original output. That is, when the power signal received by the MCU is lower than the monitoring value and the LOS signal is not received, the second control signal is output to control the output voltage of the APD boost circuit to be the second output voltage; after the MCU receives the LOS signal, it outputs the first control signal signal to control the output voltage of the APD boost circuit to be the first output voltage. The difference between the first output voltage and the second output voltage of the APD boost circuit is the preset voltage value.

The LOS threshold is set in the limiting amplifier to determine whether to output the LOS signal. In the embodiment of the present disclosure, when the output voltage of the photodetector is lower than the LOS threshold, the limiting amplifier outputs the LOS signal.

In the embodiment of the present disclosure, the MCU monitors the magnitude of the received optical power through the power signal, and when the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD boost circuit is increased by a predetermined value. Set the voltage setting value, so that the optical power value corresponding to the LOSA value will decrease (compared with when the preset voltage setting value is not increased). When the limiting amplifier reports the LOS signal, the MCU will return the APD output voltage to the normal value (that is, no longer increase the preset voltage setting value), and the LOSD value obtained when the small light gradually increases is still the same as the initial value. Large, so that the value of LOSH is enlarged.

In this disclosure, the optical power received by the optical detector gradually decays to a small light level. When the LOS signal voltage jumps from a low level to a high level, it is a LOS signal, and its corresponding optical power is LOSA; the optical power received by the optical detector is The optical power is gradually increased to maximum light. When the LOS signal voltage jumps from a high level to a low level, the LOS signal is released, and the corresponding optical power is LOSD. LOSD minus the value of LOSA is LOSH.

In some embodiments of the present disclosure, the optical power threshold and the comparison table of the power signal and the optical power can be preset in the register, and the MCU converts the size of the received current power signal into the current optical power according to the comparison table of the power signal and the optical power. power. The MCU is configured to control the output voltage of the APD boost circuit to increase if the current optical power is less than the preset optical power threshold and no LOS signal is received. The output voltage of the APD boost circuit increases, and the minimum value of the detected light power of the photodetector becomes smaller than before the boost, which optimizes the LOS performance, increases the differential output amplitude of the photodetector, and realizes the optimization of the LOS function of the light receiving part. .

In the embodiments of the present disclosure, the register may be built inside the MCU, or may be set outside the MCU, which is not specifically limited.

After the MCU receives the LOS signal, it controls the output voltage of the APD boost circuit to restore the original output. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold and the LOS signal is not received, the second control signal is output to control the output voltage of the APD boost circuit to the second output voltage; the MCU receives the LOS After receiving the signal, the first control signal is output to control the output voltage of the APD boost circuit to be the first output voltage. The difference between the first output voltage and the second output voltage of the APD boost circuit is the preset voltage value.

In the embodiment of the present disclosure, the MCU monitors the magnitude of the received optical power through the power signal, and when the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD boost circuit is increased by a predetermined value. Set the voltage setting value so that the optical power value corresponding to the LOSA value will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the APD output voltage to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, which improves the sensitivity of the light receiving part.

Corresponding to the above device, the present disclosure also provides an optical module LOS optimization method, including:

The current optical power is less than the preset optical power threshold, and the LOS signal is received, and the output voltage of the APD boost circuit is controlled to be the first output voltage.

The second output voltage is higher than the first output voltage.

The optical module LOS optimization method provided by the present disclosure includes: the current optical power is less than the preset optical power threshold, and no LOS signal is received, the MCU controls the output voltage of the APD boost circuit to be the second output voltage; the current optical power is not less than the preset The optical power threshold is set, or the current optical power is less than the preset optical power threshold and the LOS signal is received, the MCU controls the output voltage of the APD boost circuit to be the first output voltage; wherein the second output voltage is higher than the first output voltage. The MCU monitors the size of the received optical power through the power signal. When the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage value. When , the high voltage output by the APD booster circuit is the second output voltage, so that the optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, which increases the differential output amplitude of the photodetector. , to optimize LOS performance.

In some embodiments of the present disclosure, the optical module LOS optimization method is applicable to the light receiving component. To implement the above method, the light receiving component includes: a light detector, which converts the received light signal into an electrical signal. The first end of the APD boost circuit is connected to the photodetector to provide the photodetector with a reverse working voltage. The second end of the APD boost circuit is connected to the first end of the MCU, and is used for outputting a power signal to the MCU to monitor the optical power. The second terminal of the MCU is connected to the third terminal of the APD boost circuit, and outputs a control signal to the APD boost circuit to control the output voltage of the APD boost circuit. The optical detector is also connected to a limiting amplifier for amplifying the optical signal output by the optical detector, and the limiting amplifier outputs the amplified electrical signal to the host computer. The limiting amplifier is also connected with the MCU. The third end of the MCU is connected with the limiting amplifier to receive the LOS signal.

The MCU is configured to: receive the power signal of the optical detector, the power signal of the current optical power is less than the preset optical power threshold, and the LOS signal is not received, and the output voltage of the APD boost circuit is controlled to be the second output voltage;

The current optical power is not less than the preset optical power threshold, or, the current optical power is less than the preset optical power threshold and the LOS signal is received, and the output voltage of the APD boost circuit is controlled to be the first output voltage; wherein, the second output voltage is higher than first output voltage.

In order to optimize the LOS performance, increase the differential output amplitude of the optical detector, and increase the detection optical power range of the optical detector, in the embodiment provided by the present disclosure, the MCU can judge the current optical power by comparing the received power signal with the monitoring value. Whether the power signal is less than the preset optical power threshold. If the power signal is less than the monitoring value, it is determined that the power signal of the current optical power is less than the preset optical power threshold. Monitor value in the register. The MCU adjusts the control signal output to the APD boost circuit according to the power signal, and controls the output voltage of the APD boost circuit.

In a certain embodiment of the present disclosure, the first end of the APD boost circuit is connected to the APD pin of the photodetector, and is used to provide a reverse working high voltage for the APD photodiode.

The second terminal of the MCU is connected to the third terminal of the APD boost circuit, and outputs a control signal to the APD boost circuit to control the output voltage of the APD boost circuit. When the power signal received by the MCU is lower than the monitoring value, the output voltage of the APD boost circuit is controlled to increase a certain preset voltage value. According to the working principle of the photodetector, the output voltage of the APD booster circuit increases, the output amplitude of the photodetector increases, and the sensitivity of the photodetector is increased.

The monitoring value can be set according to the comparison between the power signal and the optical power. Usually, the optical power corresponding to the monitoring value is greater than the optical power value corresponding to the LOSA at the first output voltage.

In an embodiment of the present disclosure, the MCU is configured to control the output voltage of the APD boost circuit to increase if the power signal is smaller than the monitoring value and no LOS signal is received. The output voltage of the APD boost circuit increases, and the minimum value of the detected light power of the photodetector becomes smaller than before the boost, which optimizes the LOS performance, increases the differential output amplitude of the photodetector, and realizes the optimization of the LOS function of the light receiving part. .

If the output voltage of the APD boost circuit keeps increasing for a long time, the MCU will control the output voltage of the APD boost circuit to restore the original output after receiving the LOS signal. That is, when the power signal received by the MCU is lower than the monitoring value and the LOS signal is not received, the second control signal is output to control the output voltage of the APD boost circuit to be the second output voltage; after the MCU receives the LOS signal, it outputs the first control signal signal to control the output voltage of the APD boost circuit to be the first output voltage. The difference between the first output voltage and the second output voltage of the APD boost circuit is the preset voltage value.

The LOS threshold is set in the limiting amplifier to determine whether to output the LOS signal. In the embodiment of the present disclosure, when the output voltage of the photodetector is lower than the LOS threshold, the limiting amplifier outputs the LOS signal. The LOS threshold includes a LOSA threshold and a LOSD threshold. When the output voltage of the photodetector is lower than the LOSA threshold, the limiting amplifier outputs the LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In the embodiment of the present disclosure, the MCU monitors the size of the received optical power through the power signal, and when the optical power is less than a fixed value and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage fixed value, so that the optical power value corresponding to the value of LOSA will decrease (compared with when the preset voltage setting value is not increased). When the limiting amplifier reports the LOS signal, the MCU will return the APD output voltage to the normal value (that is, no longer increase the preset voltage setting value), and the LOSD value obtained when the small light gradually increases is still the same as the initial value. Large, so that the value of LOSH is enlarged.

In some embodiments of the present disclosure, the optical power threshold and the comparison table of the power signal and the optical power can be preset in the register, and the MCU converts the size of the received current power signal into the current optical power according to the comparison table of the power signal and the optical power. power. The MCU is configured to control the output voltage of the APD boost circuit to increase if the current optical power is less than the preset optical power threshold and no LOS signal is received. The output voltage of the APD booster circuit increases, and the minimum value of the detected optical power of the photodetector becomes smaller than that before the boost, which increases the differential output amplitude of the photodetector and realizes the optimization of the LOS function of the light receiving part.

In the embodiment of the present disclosure, the MCU monitors the size of the received optical power through the power signal, and when the optical power is less than a fixed value and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage fixed value, so that the optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the APD output voltage to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, which increases the differential output of the photodetector. amplitude, to optimize LOS performance.

The optical module LOS optimization method provided by the present disclosure includes:

Monitor the current optical power, and use the current optical power to compare with the preset optical power threshold;

The LOS signal is collected, and the output voltage value of the APD boost circuit is selected according to the comparison result between the current optical power and the preset optical power threshold and the LOS signal.

In an embodiment of the present disclosure, if the current optical power is greater than or equal to a preset optical power threshold, the APD boost circuit outputs a first output voltage. If the current optical power is less than the preset optical power threshold and no LOS signal is received, the MCU controls the output voltage of the APD boost circuit to be the second output voltage. If the LOS signal is received, the MCU controls the output voltage of the APD boost circuit to be the first output voltage. Wherein, the second output voltage is higher than the first output voltage. The MCU monitors the size of the received optical power through the power signal. When the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the high voltage output by the APD booster circuit is increased by the preset voltage value. When , the high voltage output by the APD booster circuit is the second output voltage, so that the optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the APD output voltage to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, which increases the differential output of the photodetector. amplitude, to optimize LOS performance.

Fig. 7 is a schematic diagram of another light receiving component according to some embodiments. As shown in the figure, the light receiving component includes: a light detector, which converts the received light signal into an electrical signal. The first end of the APD boost circuit is connected to the photodetector to provide the photodetector with a reverse working voltage. The second end of the APD boost circuit is connected to the first end of the MCU, and is used to output a power signal to the MCU to monitor the optical power. The optical detector is also connected with a limited amplifier for amplifying the optical signal output by the optical detector, and outputting the amplified electrical signal to the host computer. The limiting amplifier is also connected with the MCU. The fourth end of the MCU is connected with the limiting amplifier to receive the LOS signal.

The first terminal of the limiting amplifier is connected with the output terminal of the photodetector, and is used for receiving the electric signal of the photodetector and amplifying the electric signal. The second terminal of the limiting amplifier is connected with the fourth terminal of the MCU, and is used for sending the LOS signal to the MCU. The third end of the limiting amplifier is connected to the third end of the MCU for receiving a control signal from the MCU. The MCU receives the LOS signal, and sends a control signal according to the LOS signal, which is used to adjust the LOS threshold value set in the limiting amplifier. In order to improve the sensitivity of the photodetector and increase the detection optical power range of the photodetector, in the embodiment provided by the present disclosure, the MCU has a built-in register, and the optical power threshold is preset in the register. The MCU adjusts the control signal output to the limiting amplifier according to the power signal, and adjusts the size of the LOS threshold.

In the embodiment of the present disclosure, the APD boost circuit is provided with a current mirror circuit, which outputs the current flowing into the photodetector to the MCU in a certain proportion, so as to monitor the photocurrent detected by the photodetector, form a power signal and send it to the MCU. According to the magnitude of the power signal and the LOS signal, the MCU adjusts the LOS threshold set in the limiting amplifier.

The LOS threshold in the limiting amplifier adopts the DAC value, and the MCU outputs a control signal to adjust the size of the LOS threshold.

When the power signal received by the MCU is lower than the current threshold, the control adjusts the LOS threshold value to become smaller. According to the working principle of the limiting amplifier, the LOS threshold becomes smaller, and the corresponding optical power value triggering the LOS signal decreases, which increases the sensitivity of the photodetector.

The preset current threshold can be set according to the comparison between the power signal and the optical power. Usually the optical power corresponding to the current threshold is greater than the value of the minimum optical power that the photodetector can detect.

The LOS threshold is set in the limiting amplifier to determine whether to output the LOS signal. In the embodiment of the present disclosure, the LOS threshold includes the LOSA threshold and the LOSD threshold. When the output voltage of the photodetector is less than the LOSA threshold, the limiting amplifier outputs the LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal. Signal.

In an embodiment of the present disclosure, the MCU is configured to control the LOS threshold of the limiting amplifier to decrease if the power signal is smaller than the current threshold and no LOS signal is received. When the LOSA threshold is reduced, the optical power corresponding to the trigger LOS signal becomes smaller than before the LOSA threshold is changed, so as to realize the optimization of the LOS function of the optical receiving part.

After the MCU receives the LOS signal, it controls the LOS threshold of the limiting amplifier to recover. That is, when the power signal received by the MCU is lower than the current threshold and the LOS signal is not received, the second control signal is output, and the LOSA threshold is controlled to be the second LOSA threshold; after the MCU receives the LOS signal, the first control signal is output to control the LOSA threshold. The threshold is the first LOSA threshold. The first LOSA threshold of the limiting amplifier is greater than the second LOSA threshold.

In the embodiment of the present disclosure, the MCU monitors the size of the received optical power through the power signal, and when the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced, In this way, the optical power value corresponding to the value of LOSA will be reduced. When the limiting amplifier reports the LOS signal, the MCU will return the LOSA threshold of the limiting amplifier to the normal value. At this time, the value of LOSD obtained when the small light gradually increases is still as large as the initial value, so the value of LOSH is adjusted. stretched.

In some embodiments of the present disclosure, the optical power threshold and the comparison table of the power signal and the optical power can be preset in the register, and the MCU converts the size of the received current power signal into the current optical power according to the comparison table of the power signal and the optical power. power. The MCU is configured as follows: the current optical power is less than the preset optical power threshold, and no LOS signal is received, then the LOSA threshold of the limiting amplifier is controlled to decrease. The LOSA threshold of the limiting amplifier is reduced, the minimum value of the detection light power of the photodetector becomes smaller than before the change, the sensitivity of the photodetector is improved, and the LOS function optimization of the light receiving part is realized.

After the MCU receives the LOS signal, it controls the LOSA threshold of the limiting amplifier to restore the original output. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold, and the LOS signal is not received, the second control signal is output to control the LOSA threshold of the limiting amplifier to be the second LOSA threshold; the MCU receives the LOS output the first control signal to control the LOSA threshold of the limiting amplifier to be the first LOSA threshold. The optical power corresponding to the second LOSA threshold of the limiting amplifier is smaller than the optical power corresponding to the second LOSA threshold.

In the embodiment of the present disclosure, the MCU monitors the size of the received optical power through the power signal, and when the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by the preset fixed value, so that the optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the APD output voltage to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, thus optimizing the LOS performance of the optical module.

Corresponding to the above device, in order to optimize the LOS performance of the optical module, the present disclosure also provides a method for optimizing the LOS of the optical module, including:

The current optical power is not less than the preset optical power threshold, and the LOSA threshold of the limiting amplifier is controlled to be the first LOSA threshold;

The current optical power is less than the preset optical power threshold, and no LOS signal is received, and the LOSA threshold of the limiting amplifier is controlled to be the second LOSA threshold;

The current optical power is less than the preset optical power threshold, and the LOS signal is received, and the LOSA threshold of the limiting amplifier is controlled to be the first LOSA threshold.

The optical power corresponding to the second LOSA threshold is lower than the optical power corresponding to the first LOSA threshold.

The optical module LOS optimization method provided by the present disclosure includes: the current optical power is less than the preset optical power threshold, and no LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be the second LOSA threshold; the current optical power is not less than the preset Set the optical power threshold, or, the current optical power is less than the preset optical power threshold and the LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be the second LOSA threshold; wherein, the optical power corresponding to the second LOSA threshold is lower than Optical power corresponding to the first LOSA threshold. The MCU monitors the received optical power through the power signal. When the optical power is lower than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by the preset value, so that the LOSA The optical power value corresponding to the value will decrease. When the limiting amplifier reports the LOS signal, the MCU will return the LOSA threshold of the limiting amplifier to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, thus optimizing the optical module. LOS performance.

In some embodiments of the present disclosure, the optical module LOS optimization method is applicable to the light receiving component. To implement the above method, the light receiving component includes: a light detector, which converts the received light signal into an electrical signal. The first end of the APD boost circuit is connected to the photodetector to provide the photodetector with a reverse working voltage. The second end of the APD boost circuit is connected to the first end of the MCU, and is used to output a power signal to the MCU to monitor the optical power. The optical detector is also connected with a limited amplifier for amplifying the optical signal output by the optical detector, and outputting the amplified electrical signal to the host computer. The limiting amplifier is also connected with the MCU. The fourth end of the MCU is connected with the limiting amplifier to receive the LOS signal. The first terminal of the limiting amplifier is connected with the output terminal of the photodetector, and is used for receiving the electric signal of the photodetector and amplifying the electric signal. The second terminal of the limiting amplifier is connected with the fourth terminal of the MCU, and is used for sending the LOS signal to the MCU. The third end of the limiting amplifier is connected to the third end of the MCU for receiving a control signal from the MCU. The MCU receives the LOS signal, and sends a control signal according to the LOS signal, which is used to adjust the LOS threshold value set in the limiting amplifier.

The MCU is configured to: receive the power signal of the optical detector, the power signal of the current optical power is less than the preset optical power threshold, and no LOS signal is received, and the LOSA threshold of the limiting amplifier is the second LOSA threshold;

The current optical power is not less than the preset optical power threshold, or, the current optical power is less than the preset optical power threshold and the LOS signal is received, the LOSA threshold of the limiting amplifier is the first LOSA threshold; wherein, the second LOSA threshold is less than the first LOSA threshold a LOSA threshold threshold.

In order to improve the sensitivity of the photodetector and increase the detection optical power range of the photodetector, in the embodiment provided by the present disclosure, the MCU can compare the received power signal with the preset current threshold to determine whether the power signal of the current optical power is less than Preset optical power threshold. If the power signal is less than the preset current threshold, it is determined that the power signal of the current optical power is less than the preset optical power threshold. The current threshold is preset in the register. The MCU adjusts the control signal output to the limiting amplifier according to the power signal, and controls the LOSA threshold of the limiting amplifier.

When the power signal received by the MCU is lower than the current threshold, the LOSA threshold of the control limiting amplifier is reduced by a preset value.

The preset current threshold can be set according to the comparison between the power signal and the optical power. Usually, the optical power corresponding to the current threshold is greater than the optical power corresponding to the LOSA at the first output voltage.

In an embodiment of the present disclosure, the MCU is configured to control the LOSA threshold of the limiting amplifier to decrease if the power signal is smaller than the current threshold and no LOS signal is received. The LOSA threshold of the limiting amplifier is reduced, and the minimum value of the detection optical power of the photodetector becomes smaller than before the LOSA threshold changes, the sensitivity of the photodetector is improved, and the LOS function optimization of the light receiving part is realized.

The LOSA threshold is set in the limiting amplifier to determine whether to output the LOS signal. In the embodiment of the present disclosure, when the output voltage of the photodetector is lower than the LOSA threshold, the limiting amplifier outputs the LOS signal. The LOS threshold includes a LOSA threshold and a LOSD threshold. When the output voltage of the photodetector is lower than the LOSA threshold, the limiting amplifier outputs the LOS signal; when the output voltage of the photodetector is greater than the LOSD threshold, the limiting amplifier releases the LOS signal.

In the embodiment of the present disclosure, the MCU monitors the size of the received optical power through the power signal, and when the optical power is less than a fixed value and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by a preset value , so that the optical power value corresponding to the value of LOSA will be reduced. When the limiting amplifier reports the LOS signal, the MCU returns the voltage output by the APD to the normal value. At this time, the value of LOSD obtained when the light is gradually increased is still the same as the initial value, so that the value of LOSH is enlarged. .

This solution optimizes the software level on the basis of the existing and conventional hardware solutions, without adding any cost, but it can effectively improve the problem of too small LOSH. It can also flexibly configure the current threshold and preset value through the MCU according to your own needs. Or an appropriate value of the LOSA threshold to optimize the LOS performance of the optical module.

In some embodiments of the present disclosure, the optical power threshold and the comparison table of the power signal and the optical power can be preset in the register, and the MCU converts the size of the received current power signal into the current optical power according to the comparison table of the power signal and the optical power. power. The MCU is configured as follows: the current optical power is less than the preset optical power threshold, and no LOS signal is received, then the LOSA threshold of the limiting amplifier is controlled to decrease. The LOSA threshold of the limiting amplifier is reduced, and the minimum value of the detected optical power of the photodetector becomes smaller than before the change, which optimizes the LOS performance of the optical module and realizes the optimization of the LOS function of the light receiving part.

After the MCU receives the LOS signal, it controls the LOSA threshold of the limiting amplifier to restore to the original. That is, when the current optical power corresponding to the power signal received by the MCU is lower than the optical power threshold, and the LOS signal is not received, the second control signal is output to control the LOSA threshold of the limiting amplifier to be the second LOSA threshold; the MCU receives the LOS output the first control signal to control the LOSA threshold of the limiting amplifier to be the first LOSA threshold. The difference between the first LOSA threshold and the second LOSA threshold of the limiting amplifier is the preset value.

In the embodiment of the present disclosure, the MCU monitors the received optical power through the power signal, which can be a current signal. When the optical power is less than a fixed value and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced to Small preset value, so that the optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to the normal value. At this time, the LOSD value obtained when the small light is gradually increased is still the same as the initial value, thus optimizing the LOS performance of the optical module.

Collect the LOS signal, and select the LOSA threshold of the limiting amplifier according to the comparison result between the current optical power and the preset optical power threshold and the LOS signal.

In an embodiment of the present disclosure, if the current optical power is greater than or equal to a preset optical power threshold, the LOSA threshold of the limiting amplifier is the first threshold. If the current optical power is less than the preset optical power threshold and no LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be the second LOSA threshold. If the LOS signal is received, the MCU controls the LOSA threshold of the limiting amplifier to be the second LOSA threshold. Wherein, the first LOSA threshold is higher than the second LOSA threshold. The MCU monitors the received optical power through the power signal. When the optical power is less than the preset optical power threshold and confirms that the limiting amplifier does not report the LOS signal, the LOSA threshold of the limiting amplifier is reduced by the preset value. At this time, The optical power value corresponding to the value of LOSA will decrease. When the limiting amplifier reports the LOS signal, the MCU returns the LOSA threshold of the limiting amplifier to the normal value. At this time, the LOSD value obtained when the small light gradually increases is still the same as the initial value, thus optimizing the optical module LOS performance. .

FIG. 8 is a schematic diagram of another light receiving component according to some embodiments. As shown in the figure, the light receiving part includes: a photodetector for converting a light signal into an electric signal. The limiting amplifier is provided with a LOS signal pin for outputting a high level or a low level, and a limiter control terminal. The APD step-up circuit includes: a control interface; a power supply interface connected with the photodetector to supply power to the photodetector; an output interface which outputs the power signal of the optical signal. MCU, including: detection pins, connected to the output interface to receive power signals; input pins, connected to the limiting amplifier, used to receive high or low levels; APD adjustment pins, connected to the control interface; limiter The adjustment pin is connected with the limit release adjustment terminal. There is a power signal monitoring value inside the MCU; when the calculation determines that the power signal is less than the monitoring value, and the input pin receives a high level, the APD adjustment pin sends a signal to the control interface. The output voltage of the power supply interface rises, and the discharge limit adjustment pin Send a control signal to the limiter to lower the LOS threshold.

In a certain embodiment of the present disclosure, the APD adjustment pin sends a signal to the control interface to increase the output voltage of the power supply interface, and the discharge limit adjustment pin sends a control signal to the discharge limit adjustment terminal to reduce the LOS threshold adjustment process, which is consistent with the previous expression , which will not be introduced one by one here.

Corresponding to the above device, an optical module LOS optimization method is also provided, including: calculating the current optical power according to the power signal;

The current optical power is not less than the preset optical power threshold, controlling the LOS threshold of the limiting amplifier to be the first LOSA threshold, or controlling the output voltage of the APD boost circuit to be the first output voltage;

The current optical power is less than the preset optical power threshold, and no LOS signal is received, the LOS threshold of the control limiting amplifier is the second LOSA threshold, or the output voltage of the APD boost circuit is controlled to be the second output voltage;

The current optical power is less than the preset optical power threshold, and the LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be the first LOSA threshold, or the output voltage of the APD boost circuit is controlled to be the first output voltage;

Wherein, the first LOSA threshold is higher than the second LOSA threshold; the second output voltage is higher than the first output voltage.

The current optical power is not less than the preset optical power threshold, the LOS threshold of the limiting amplifier is controlled to be the first LOSA threshold, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

The current optical power is less than the preset optical power threshold, and no LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be the second LOSA threshold, and the output voltage of the APD boost circuit is controlled to be the second output voltage;

The current optical power is less than the preset optical power threshold, and the LOS signal is received, the LOS threshold of the limiting amplifier is controlled to be the first LOSA threshold, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

Since the above implementation methods are described in conjunction with reference to other methods, different embodiments have the same parts, and the same and similar parts of the various embodiments in this specification can be referred to each other. No further elaboration here.

It should be noted that in this specification, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply No such actual relationship or order exists between these entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a circuit arrangement, article or apparatus comprising a set of elements includes not only those elements but also elements not expressly listed Other elements, or also include elements inherent in such circuit structures, articles or equipment. Without further limitations, the presence of an element qualified by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the circuit structure, article or device comprising the element.

Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure. The present disclosure is intended to cover any modification, use or adaptation of the present disclosure. These modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. . The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

The above embodiments of the present disclosure do not limit the protection scope of the present disclosure.

Claims

An optical module, comprising:

Photodetectors for converting optical signals into electrical signals;

The limiting amplifier is used to set the LOS signal pin to output high level or low level;

APD boost circuit, including:

control interface;

A power supply interface connected to the photodetector to supply power to the photodetector;

an output interface for outputting a power signal of the optical signal;

MCUs, including:

a detection pin connected to the output interface to receive the power signal;

an input pin connected to the limiting amplifier for receiving the high level or the low level;

adjustment pin, connected with the control interface,

A power signal monitoring value is set inside the MCU; when the operation determines that the power signal is smaller than the monitoring value, and the input pin receives the high level, the adjustment pin sends a signal to the control interface , the output voltage of the power supply interface increases.
The optical module according to claim 1, further comprising a discharge limiting control terminal and a discharge limiting adjustment pin;

The discharge limit regulation pin is connected to the discharge limit regulation terminal, and the discharge limit regulation pin is used to send a control signal to the discharge limit regulation terminal to lower the LOS threshold.
The optical module according to claim 2, the adjustment pin is an APD adjustment pin.
The optical module according to claim 1, wherein the limiting amplifier is provided with a signal input end connected to the photodetector to receive the electrical signal.
According to the optical module according to claim 4, a LOS threshold is set in the limiting amplifier; when the calculation determines that the electrical signal is smaller than the LOS threshold, the high level is output.
According to the optical module according to claim 4, the APD boost circuit includes a current mirror circuit for mirroring the photocurrent output by the photodetector to form the power signal and transmit it to the MCU.
According to the optical module according to claim 6, when the calculation determines that the power signal is smaller than the monitoring value, and the input pin receives the high level, the adjustment pin sends a signal to the control interface, The output voltage of the power supply interface increases, including:

The power signal is not less than the monitoring value, the adjustment pin outputs a first control signal to the control interface, and controls the output voltage of the power supply interface to be the first output voltage;

The power signal is smaller than the monitoring value, and the input pin receives the high level, the adjustment pin outputs a second control signal to the control interface, and controls the output voltage of the power supply interface to be the second The output voltage;

The power signal is smaller than the monitoring value, and the input pin receives the low level, the adjustment pin outputs a first control signal to the control interface, and controls the output voltage of the power supply interface to be the first output voltage;

Wherein, the second output voltage is higher than the first output voltage.
According to the optical module according to claim 1, the limiting amplifier is provided with an amplifying output terminal, which outputs an amplified electrical signal.
A method for optimizing the LOS of an optical module, comprising:

Calculate the current optical power according to the power signal;

The current optical power is not less than the preset optical power threshold, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

The current optical power is less than the preset optical power threshold, and no LOS signal is received, and the output voltage of the APD boost circuit is controlled to be a second output voltage;

The current optical power is less than a preset optical power threshold, and the LOS signal is received, and the output voltage of the APD boost circuit is controlled to be the first output voltage;

Wherein, the second output voltage is higher than the first output voltage.
The optical module LOS optimization method according to claim 9,

The current optical power is not less than a preset optical power threshold, and the method also includes:

The LOS threshold of the control limiting amplifier is the first LOSA threshold threshold;

The current optical power is less than the preset optical power threshold, and no LOS signal is received, and the method further includes:

controlling the LOS threshold of the limiting amplifier to be a second LOSA threshold;

The current optical power is less than a preset optical power threshold, and the LOS signal is received, the method further includes:

controlling the LOS threshold of the limiting amplifier to be a first LOSA threshold;

The first LOSA threshold is higher than the second LOSA threshold.
The optical module LOS optimization method according to claim 9, further comprising: the limiting amplifier selects whether to send the LOS signal according to the LOS threshold and the current optical power.
According to the optical module LOS optimization method according to claim 9, the output voltage of the APD boost circuit is used for the working voltage of the photodetector.